When I booked our cruise today the CM asked me if I wanted to prepay my tips. I thought that was a great idea and so paid $168 which was $12 per person for 7 days. Now I am reading on the boards about giving tips to everyone - how much, when, etc. What is up with that? Do most people NOT prepay tips on a cruise? this is my first cruise and I don't want to not tip someone who should have been tipped but sure don't want to tip twice!